Mercurial > daily-edition

annotate daily-edition.js @ 56:35edfd76a3f7

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added localStorage-based caching for latest issue.
author Atul Varma <varmaa@toolness.com>
date Fri, 13 Aug 2010 06:04:28 +0000
parents 995aaa2f079a
children 182af9ac76fb
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52
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1 function isUrlSafe(url) {
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2 if (typeof(url) != "string")
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3 return false;
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4 return (url.match("^https?://") != null);
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5 }
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6
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7 var imgRemover = html.makeHtmlSanitizer(
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8 function(tagName, attribs) {
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9 if (/^img$/i.test(tagName))
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10 return null;
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11 return attribs;
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12 });
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13
52
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14 function safeHtml(html) {
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15 var out = [];
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16 imgRemover(html, out);
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17 html = out.join('');
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18 return html_sanitize(
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19 html,
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20 function urlPolicy(url) {
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21 return isUrlSafe(url) ? url : null;
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22 });
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23 }
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24
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25 const DEFAULT_JSON_FILE = 'daily-edition.json';
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26 var jsonFile = DEFAULT_JSON_FILE;
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27
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28 function showError() {
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29 var json;
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30
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31 if (jsonFile == DEFAULT_JSON_FILE)
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32 json = window.localStorage[DEFAULT_JSON_FILE];
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33
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34 if (json)
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35 showContent(json);
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36 else {
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37 $("#error").show();
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38 $("#container").fadeIn("fast");
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39 }
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40 }
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41
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42 function showContent(json) {
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43 if (window.JSON)
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44 info = JSON.parse(json);
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45 else
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46 info = eval("(" + json + ");");
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47
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48 $("#issue-no").text(info.id + 1);
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49 $("#pub-date").text(info.pubDate.join("."));
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50
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51 info.authors.forEach(
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52 function(author) {
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53 if (author in info.articles)
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54 info.articles[author].forEach(
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55 function(article) {
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56 var div = $("#templates .article").clone();
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57 var date = article.pubDate.join(".");
52
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58 var title = safeHtml(article.title);
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59 div.find(".title .link").html(title);
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60 div.find(".title .link").attr("href", article.url);
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61 div.find(".author").text(author);
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62
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63 var html = [];
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64 article.content.forEach(
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65 function(content) {
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66 if (content.type == "text/html")
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67 html.push(safeHtml(content.value));
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68 });
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69
32
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70 if (html.length > 0) {
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71 var content = div.find(".content");
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72 content.html(html[0]);
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73 if (content.get(0).firstChild.nodeType == 3)
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74 // The child isn't wrapped in a containing block
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75 // element, so do that to ensure it has some
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76 // padding from everything around it.
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77 content.html("<p>" + html[0] + "</p>");
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78 }
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79 div.find(".date").text(date);
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80 $("#articles").append(div);
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81 });
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82 });
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83
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84 $("#container").fadeIn("fast");
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85 }
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86
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87 $(window).ready(
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88 function() {
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89 var req = new XMLHttpRequest();
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90
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91 var matches = location.search.match(/\?issue=([0-9]+)/);
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92 if (!matches)
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93 matches = location.hash.match(/\#issue=([0-9]+)/);
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94 if (matches)
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95 jsonFile = 'issue-' + parseInt(matches[1]) + '.json';
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96
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97 req.open('GET', jsonFile);
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98 req.overrideMimeType('text/plain');
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99 req.addEventListener("error", showError, false);
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100 req.addEventListener(
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101 "load",
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102 function(event) {
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103 var info;
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104
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105 if (req.status != 200) {
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106 showError();
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107 return;
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108 }
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109
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110 if (jsonFile == DEFAULT_JSON_FILE)
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111 window.localStorage[DEFAULT_JSON_FILE] = req.responseText;
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112
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113 showContent(req.responseText);
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114 },
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115 false
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116 );
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117 req.send(null);
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118 });